I have just received a P1A and a P1C which brings the total of my Klarus lights up to 6:
The two new ones are both no-nonsense, simple and not too expensive 2-level lights that appear to be as tough as the manufacturer claims. The deep OP reflectors put out a sufficiently clean and rather narrow beam in which only faint darker rings can be spotted against a white wall. The outputs are good without being ovewhelming. The reversible clips are definitely stronger than most of the competitors' ones.
Klarus says on the instruction sheets not to use li-ion cells.
These P series lights seem to be a good choice for those who like to keep things simple.
The only defect I could find is in the fact that the heads' surfaces are too smooth which makes the level changing a bit difficult especially on the P1C whose body is significantly shorter. One handed operation is hardly possible.